/Engine/Source/Runtime/Experimental/Chaos/Public/GeometryCollection/ManagedArray.h
Reindex - Adjust index dependent elements. Offsets is the size of the dependent group; Final is post resize of dependent group used for bounds checking on remapped indices.
virtual void Reindex &40; const TArray< int32 > & Offsets, const int32 & FinalSize, const TArray< int32 > & SortedDeletionList, const TSet< int32 > & DeletionSet &41;